Claims
- 1. A fluid displacement apparatus comprising:
- a housing having a fluid inlet port, a fluid outlet port and a sleeve;
- a fixed scroll fixedly disposed within said housing and having a first end plate;
- a first wrap extending from said first end plate;
- an orbiting scroll movably disposed within said housing and having a second end plate;
- a second wrap extending from a surface of said second end plate, said first and second wraps interfitting at an angular offset to make a plurality of line contacts and thereby define at least one sealed off fluid pocket;
- a boss extending from a surface of said second end plate opposite the surface from which the second wrap extends;
- a drive shaft rotatably supported by said sleeve of said housing, said drive shaft having a disk at its inner end,
- a bushing having a generally cylindrical circumferential surface rotatably supported in said boss by a bearing, said bushing having a hole spaced eccentrically from a center of said bushing, said center of said bushing spaced from a center of said drive shaft a distance equal to a radius of orbiting motion of said orbiting scroll;
- a balance weight extending radially from said connection portion about a portion of said circumferential surface;
- a crank pin extending from said disk toward said bushing at a location spaced from an axis of rotation of said drive shaft, said crank pin inserted into said eccentric hole in said bushing; and,
- regulating means disposed between said crank pin and said eccentric hole for regulating an angle by which said bushing swings around a radial center of said crank pin, said regulating means comprising:
- at least one arc shaped projection extending from an inner wall of said eccentric hole; and,
- at least one arc shaped groove formed on a peripheral surface of said crank pin.
- 2. A fluid displacement apparatus comprising:
- a housing having a fluid inlet port, a fluid outlet port and a sleeve;
- a fixed scroll fixedly disposed within said housing and having a first end plate;
- a first wrap extending from said first end plate;
- an orbiting scroll movably disposed within said housing and having a second end plate;
- a second wrap extending from a surface of said second end plate, said first and second wraps interfitting at an angular offset to make a plurality of line contacts and thereby define at least one sealed off fluid pocket;
- a boss extending from a surface of said second end plate opposite the surface from which the second wrap extends;
- a drive shaft rotatably supported by said sleeve of said housing, said drive shaft having a disk at its inner end,
- a bushing having a generally cylindrical circumferential surface rotatably supported in said boss by a bearing, said bushing having a hole spaced eccentrically from a center of said bushing, said eccentric hole having at least one arc shaped projection extending from an inner wall thereof, said center of said bushing spaced from a center of said drive shaft a distance equal to a radius of orbiting motion of said orbiting scroll;
- a balance weight extending radially from said connection portion about a portion of said circumferential surface;
- a crank pin extending from said disk toward said bushing at a location spaced from an axis of rotation of said drive shaft, said crank pin inserted into said eccentric hole in said bushing, said crank pin having at least one arc shaped groove formed on a peripheral surface thereof; and,
- regulating means disposed between said crank pin and said eccentric hole for regulating an angle by which said bushing swings around a radial center of said crank pin;
- wherein said regulating means comprises:
- said arc shaped groove formed on a peripheral surface of said crank pin engaging with said arc shaped projection extending from an inner wall of said eccentric hole; and,
- a radial gap between said crank pin and said eccentric hole.
- 3. The fluid displacement apparatus recited in claim 2, wherein said radial gap is defined by a distance through which said crank pin draws a locus during orbital motion of said orbital scroll.
- 4. A fluid displacement apparatus comprising:
- a housing having a fluid inlet port, a fluid outlet port and a sleeve;
- a fixed scroll fixedly disposed within said housing and having a first end plate;
- a first wrap extending from said first end plate;
- an orbiting scroll movably disposed within said housing and having a second end plate;
- a second wrap extending from a surface of said second end plate, said first and second wraps interfitting at an angular offset to make a plurality of line contacts and thereby define at least one sealed off fluid pocket;
- a boss extending from a surface of said second end plate opposite the surface from which the second wrap extends;
- a drive shaft rotatably supported by said sleeve of said housing, said drive shaft having a disk at its inner end,
- a bushing having a generally cylindrical circumferential surface rotatably supported in said boss by a bearing, said bushing having a hole spaced eccentrically from a center of said bushing, said center of said bushing spaced from a center of said drive shaft a distance equal to a radius of orbiting motion of said orbiting scroll;
- a balance weight extending radially from said connection portion about a portion of said circumferential surface;
- a crank pin extending from said disk toward said bushing at a location spaced from an axis of rotation of said drive shaft, said crank pin inserted into said eccentric hole in said bushing; and,
- regulating means disposed between said crank pin and said eccentric hole for regulating an angle by which said bushing swings around a radial center of said crank pin, said regulating means comprising:
- said crank pin and said eccentric hole having analogous radial cross sections, said analogous radial cross sections including at least one portion operative to limit the angle by which the bushing rotates around said crank pin, said at least one portion of said analogous radial cross sections comprising an arc shaped groove engaging with an arc shaped projection; and,
- a radial gap between said crank pin and said hole, said radial gap comprising an arc shaped cross section defined by said arc shaped groove and said arc shaped projection.
- 5. The fluid displacement apparatus recited in claim 4, wherein said radial gap is defined by a distance through which said crank pin draws a locus during orbital motion of said orbital scroll.
Priority Claims (1)
Number |
Date |
Country |
Kind |
6-253054 |
Sep 1994 |
JPX |
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Parent Case Info
This application is a divisional of application Ser. No. 08/530,890, filed Sep. 20, 1995, abandoned.
US Referenced Citations (3)
Divisions (1)
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Number |
Date |
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Parent |
530890 |
Sep 1995 |
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